Siemens simatic et 200s Operating Instructions Manual page 293

Error Acknowledgment EXTF_ACK
You must acknowledge the corrected errors (short circuit of the sensor supply and open
circuit/short circuit of the sensor signals).
What You Do
Your control program detects the set feedback bit
ERR_ENCODER.
Execute your application-specific error response.
Eliminate the cause of the error.
Switch the EXTF_ACK control bit from 0 to 1
Switch the EXTF_ACK control bit from 1 to 0
In the case of constant error acknowledgment (EXTF_ACK = 1) or at CPU/Master Stop, the 1PosSSI/Analog reports the
errors as soon as they are detected and deletes them as soon as they have been eliminated.
Parameters
Parameters
Enables
Group diagnostics
Encoder signal
diagnostics
Feedback Messages
Address
Byte 0
Byte 4
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
Meaning
An encoder error (ERR_ENCODER) or parameter
assignment error results in a channel-specific
diagnostics if group diagnostics is enabled.
Encoder signals D, /D and C, /C are monitored for short
circuit and wire break.
Assignment
Bit 7: ERR_ENCODER
Bit 3: SYNC
Bit 2: POS_ DONE
Bit 1: POS_ERR
Bit 0: POS_ACK
Bit 1: JOB_ERR
Bit 0: JOB_ACK
6.6 Functions of the 1PosSSI/Analog
Response of the 1PosSSI/Analog
Feedback bit ERR_ENCODER=1
The 1PosSSI/Analog sets the feedback bit
ERR_ENCODER = 0.
This tells you that the cause has been eliminated and
acknowledged.
If ERR_ENCODER = 1, the cause of the error is not yet
eliminated.
Value range
Disable
•
Enable
•
On
•
Off
•
1PosSSI/Analog
Default setting
Disable
On
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